Founded by President Dwight D. Eisenhower in 1956, Sister Cities International is a nonpartisan 501(c)(3) nonprofit which serves as the national membership organization for individual sister cities, counties, and states across the United States. This network unites tens of thousands of citizen diplomats and volunteers in over 300 member communities with over 2,000 partnerships in more than 140 countries.


We are a hub for institutional knowledge and best practices in the field of citizen diplomacy. As a membership association, we work to strengthen the sister cities network by providing essential services, programs, and resources to help members find partners as well as to expand and improve activities.

Click the links below to learn more about membership with Sister Cities International, the programs we offer, and how our members promote peace through exchanges.